Percussive tool valve



Dec. 4, 1934. w. A. SMITH, JR, El AL 1,982,700

PERCUSSIVE TOOL VALVE Filed March 1, 1934 INVENTORS 4 1 BY M A TTORNE Y Patented Dec. 4, 1934 1;982,70Q PERCHSSIVE Tool. vALve William A, .Smith, I N rth Arlington, J, and 1 Herman J. Schorle, Astoria, N.-'-Y.,'assignors to Worthington Pump and Machinery Corpora- :tion, New York, Y., a corporation of Virginia.

. Application Ma ch 1, 1934 se ial s 713,515 lclaims. (Gl.12'1-1l) This invention relates to percussive tools and more particularly to waive: therefore.

An object cf the invention is :to provide a valve for uontrcllingihe distribution of the pressure a percussiveiooLmhich valve is positive and quick in action and one which will provide a'vheavy blow of the-hammer piston of mum and will cut down the consumption of pressure fluidin proportion to the amount of-work per.-

formed.

with these and other objects in "view as may ppear from the specification, she invention 'consistsoivarious matures of con structicn and combination of carts, which will be first described in connection with *the accom marrying-drawing, showings balancing structure of the-preferred form, and the features forming theinvention will'he specifically pointed out in the claims. l v In the drawing: r 1 Eigwl is a'fragmentary longitudinal section through ai'percussive' tool showing the improved 2 .is a fragmentary longitudinal section similar to Fig. '1 showing the valve in a dilferent mm. I Rig. is an enlarged longitudinal section flmwughflnevalue and valve-chest. 1 a a Figjisaaisometricviewof the-valve.

Mei-ring more particularly to the drawing, the improved percussive iaoo'l comprises a cylinder [having a piston chamber 12 therein in which the vision 8 reclpr oeates. A back head 4 is atinched in the usual manner to the cylinder 1 amltms a valve chest 5 therein-in which 'the valve 10, whim contrms the' distributlon of pressure fluid $0 {the piston chamber 2 is minted. l Pressure fluid is delivered to =the'valve chest 5 chrough the sport 6, the annularchannel 7 formalin m me: head 4. The delivery'of she measure to the channel 7 is controlled by the usual tyne of Wattle valve 8. l The valve 10, which zeclmccabes the valve chest .5 comprises a cup-like body ll, {the forward end of whidiopens through the passagei) into the piston Ghamber'2, and consequently the inner surface 12 of the transverse wall '13 of the body l l is to compression from the piston chamher 2 for compacting withihe pressure fluid against the pressure area, 14 formed on the body 11 "by the-annular channel 15. The annular channel 15 is cut in thebody 11 a short distance rearwardly from 'the for-Ward open" end of the body. The pressm e fluid is delivered to the an- ;mlanehannsl-lihy aplurality of radially spaced posed to atmospheric ports "16 formed in the valve chest 5'; The body 131- is undercuc at its forward open end to provide the chamber 17 and this'undercut togeth r with the annular channel 15 form acflanxe '18, The flange '18 is provided with a plurality of perforat-lons 19 formed rhereinrhmugh which pressure fluid passes into the annular chamber 17. The underrsurface of :the flange 18 forms a pressure area against which live pressure fluid presses for co-operating with thepressure fluid against; the 05 wall 14 and the compression against the wall 1-2 for holding :the valve 10 in its rearward position as shown in 2 of lrhedmwin thereby per.- mitcing the live pressure fluid to pass through the port or passage 9 into the rearend of the piston chamber 2 for driving the hammer vision 3 forwardly. As the hammer piston 3 moves lorwardly and passes the exhaust port 20 formed in the earlinder 1 the pressure against the flange 18, pres sure area 14 and. pressure area '12 is relieved and the forward end or the piston chamber 2 which is opened through the-ports 21 delivers compression from the port '22 into the chamber 23 and thence on the rear side of-the transverse wall 13 9 o f-the body 11 within the ring flange 25 which projects rearwardly from the transverse wall 13. The portion of the transverse wail exterior-1y of the outer periphery cfthe ring flange 2'5 exposed -to pressure fluid in the chamber '26. T 'he W, chamber 26 has communication with the annular channel '7 through ports 27. when the pressure in the rear end of the cylinder is relieved, the pressure of compression against the pressu-rearea 24 and the pressure of pressme fluid 9!? against the rear surface of the tranverse wall 13 will move the valve 10 to its forward position as shown in Figs. 1 and 3 of the drawing and will move the rear surface of the tran-sverscwall 13 away fromthe seat 28. When the valve body 11 85 is moved away from the seat 28 the pressurefiu-id will pass through the clearance space-30 into the chamber -23 and outwardly through the ports 22 and 21 into the forward end of the piston chamber 22 for driving the piston hammer '3 rear- 1 war-div.

The cup-like body 11 of the valve "10 has an annula sh ulde 31 onn d ther n hi h expressure in the anmuar chamber '32 ,f 0 Tm,ed in the valve chest "'5. A port v 33 extends through the valve chest fi and has conununicatlon :with the atmosphere through flats or channels 34 formed on or in the valve chest so that the flange 81 will'be exposed to atmospheric pressure for assisting in holding the valve in the opposite direction, and an shoulder formed compression in the rear end of the piston cham-" ber building up and engaging against the pres.- sure area 12 co-operates with the pressure oi the presssure fluid against the flange -l8-- and pressure area 14 to overcome theatmospheric pressure on the shoulder 31 andlthepressure of the pressure fluid on the rear/surface{oithef transverse wall 13 for moving the valveqlo into its rearward position as shown in Fig. 2 to permit the pressure fluid to pass through the passage 9 into the rear end of the piston chamber;

It will be understood that the invention is not to be limited to the specific construction or arrangement of "parts shown but that they may be widelyimodifled within the invention defined by the claims. i

What is claimed is: l "1; In a percussive tool, the combination of. a cylinder having a piston chamber therein, a piston. in said chamber,.an exhaust port in the cylinder, a valve chest having a valve chamber, inlet passagesleading from the valve chamber to the piston chamber, a valve in .saidcharnber comprisingacup-like bodyincluding a cylindrical wall andjaztransverse wall, said body having an annular groove formed therein'providing a flange, ports leading to; said groovefor supplying pressure fluid thereto, the rear wall of said groove forming a pressure surface exposed to pressure fluid and the forward surface of said transverse wall being exposed to compression from -the cylinder forthrowing the valve in one direction, a part of the rear of said. transverse wall being exposed to pressure fluid andi-the remaining portion of the rear side of said transverse wall being exposed to compression for throwing the valve in the opposite direction; I 7 .2. In a percussive tool, the combination of a cylinder having a piston chamber therein, a piston in-said chamber, an exhaust port in the cylinder, a valve chest having a valve chamber, in-

let passages leadingfrom the valve chamber to the piston chamber, a valve in said chamber comprising a cup-like body including a cylindrical wall and a transverse wall, said body having an annular groove formed therein providing a flange, ports leading to said groove for supplying -pressure fluid thereto, the rear wall of said groove forming a pressure surface exposed to pressure fluid and the forward surface of said transverse wall being exposed to compression from the cylinder for throwing the valve in one direction, a part of the rear surface of said transverse wall being exposed to pressure fiuid and the remaining portion of the rear sideof saidtransverse wall being exposed to compression forthrowing the i annular on said cylindrical ,wall and exposed to atmospheric pressure for assistingin throwing said valve in onedirection. s

..3. In a percussive. tool, the combination of a cylinder having a piston chamber therein, a pistonin said chamber, an exhaust port in the cyl-I 1nder, a valve chest having a valve chamber, inlet passages leading from the valve chamber to the piston chamber, a valve in said chamber comprising a cup like body including a cylindrical wall and a transverse wall, said body having an annular groove formed therein providing a flange, ports leading to said groove for supplying pressure fluid thereto, the rear wall of said groove forming a pressure surface exposed to pressure fluid and-the forward surface of said transverse wall being exposed to compressionfrom the cylinder for throwing the valve inbne direction, a part of the rear surface of said transverse wall being exposed to pressure fluid and the remaining portion of the rear side of said transverse wall exposed to compression for throwing the valve in the opposite direction, and an annular shoulder formed on-said cylindrical wall and exposed to atmospheric pressure for assisting in throwing said valve in one direction, said flange provided with ports-to admit pressure fluid to the rear'end of the cylinder.

" 4. In a percussive tool, the combination of a cylinder having a piston chamber therein, a piston'in said chamber, an exhaust port in the cylinder, a':valve chest havinga'valve chamber, inlet passages leading from the valve chamber t'o the piston chamber, a valve insaid chamber comprising a cup-like body including a cylindrical wall and a transverse wall, said-bodyv having an annular groove formed thereinpro'viding a flange, ports leading to said groov -rm supplying pressure. fluid thereto, the rear wall of said groove forming apressure surface; exposed-to pressure fluid and the forward surface ofrsaid transverse .-wall being exposed to compression from. the cylinder for throwing, the valve in one direction, a part of the rear surface of said transverse wall being exposed to pressure fluid and the remaining portion of the rear side ofsaidtransverse wall being exposed to compression for throwing the valve in the opposite direction,-and a ring formed ongtheouter surface of said transverse wall and co-operating with adjacent sure faces of said valve chest to provide a restricted clearance space for controlling the delivery of pressure fluid to the-forward end of the cylinder.

5. In a percussive tool, the combination of a cyl-e inder having a'piston'chamber therein, a piston I i.

in said chamber, an exhaust port in the cylinder, a valve chest having a valve chamber, inlet passages leadingfromthe, valve chamber to, the piston chamber, a valve in said chamber comprising a cup-like body including acylindrical wall and a transverse wall, said body,, having an? annular groove formed therein providing a flange, ports leading to said groove for supplying pressure fluid thereto, the rear wall of said groove forming a pressure surface exposed to pressurefluid and the forward surfaceof said transverse wall being exposed to compression from the cylinder for throwing the valve in on'edirection, a part of therear surface of, said transverse wallibeing exposed to pressure fluid and the remainingpportion of the rear, side of said transverse wall being exposed to compression 'f-or throwing the valve inthe :oppm site direction, a ring formed on the outer surface of said transverse wall and co operating with" adacent surfaces of saidvalve chest; toprovide a restricted clearance space for controllingthe de livery of pressure fiuidtothe forward-end of the cylindenand an annular-shoulder formed on said cylindrical wall and exposed .to at mospherie pressure for assisting in throwing said valve in one direction. s 1 6. In a percussive t0q1 -the; cpmbinqtion-.-pfra cylinder having apiston chamber therein, a piston in said chamber, an exhaust portin the cylinder, a valve chesthaving a valve chamber,

inlet passages leadingfrom thevalvechamber to the piston chamber, a valve in said chamber comprising a cup-like body including a cylindri-- cal wall and a transverse wall, said valve chest provided with a chamber outwardly of the outer side of said transverse wall and with ports for supplying pressure fluid to said chamber, and a ring flange formed on the rear surface of said transverse wall and cooperating with adjacent surfaces of said valve chest to provide a restricted clearance space for controlling the delivery of pressure fluid to the forward end of the cylinder.

7. In a percussive tool, the combination of a cylinder having a piston chamber therein, a piston in said chamber, an exhaust portin the cylinder, a valve chest having a valve chamber, inlet passages leading from the valve chamber to the piston chamber, a valve in said chamber comprising a cup-like body including a cylindrical wall and a transverse wall, said body having an annular groove formed therein providing a flange, ports leading to said groove for supplying pressure fluid thereto, the rear wall of said groove forming a pressure surface exposed to pressure fluid and the forward surface of said transverse wall being exposed to compression from the cylinder for throwing the valve in one direction, a part of the rear surface'of said transverse wall being exposed to pressure fluid and the remaining portion of the rear side of said transverse wall being exposed to compression for throwing the valve in the opposite direction, a ring formed on the outer surface of said transverse wall and co-operating with adjacent surfaces of said valve chest to provide a restricted clearance space for controlling the delivery of pressure fluid to the forward end of the cylinder, and an annular shoulder formed on said cylindrical wall and exposed to atmospheric pressure for assisting in throwing said valve in one direction, the rear surface of said transverse wall inside of said ring forming a pressure area subjected alternately to compression from the piston chamber for assisting in throwing the valve in one direction and to pressure fluid forholding the valve in one position.

WILLIAM A. SMITH, JR. HERMAN J. SCHORLE. 

